What is the bottom layer of tcp/ip

The bottom layer of tcp/ip is the network interface layer. The network interface layer is located on the fourth layer. Since the network interface layer merges the physical layer and the data link layer, the network interface layer is the physical medium for transmitting data. , can also provide an unmistakable line to the network layer.

#The operating environment of this article: Windows 7 system, Dell G3 computer.

The bottom layer of tcp/ip is the network interface layer

In the TCP/IP protocol, the network interface layer is located on the fourth layer. Since the network interface layer merges the physical layer and the data link layer, the network interface layer is not only the physical medium for transmitting data, but also provides an accurate line for the network layer.

The network interface layer is not actually part of the Internet protocol suite, but it is the method by which packets are transmitted from the network layer of one device to the network layer of another device. This process can be controlled in the software driver of the network card, or in firmware or a dedicated chip.

This will complete some data link functions such as adding headers to prepare for sending and actually sending over the physical medium. On the other end, the link layer will complete the data frame reception, remove the header and pass the received packet to the network layer.

Extended information

The other three layers of TCP/IP protocol——

1. Application layer: The application layer is TCP/IP The first layer of the protocol directly provides services to the application process.

2. Transport layer: As the second layer of the TCP/IP protocol, the transport layer plays a mainstay role in the entire TCP/IP protocol. And in the transport layer, TCP and UDP also play the mainstay role.

3. Network layer: The network layer is located at the third layer of the TCP/IP protocol. In the TCP/IP protocol, the network layer can perform functions such as establishing and terminating network connections and searching for IP addresses.

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